I have:

Bank 1 - IBAN xxxx xxxx xxxx xxxx xxxx xxxxx  - Account Chart 572.0.0.00001

Bank 2 - IBAN yyyy yyyy yyyy yyyy yyyy yyyy - Account Chart 572.0.0.00002

And I want all my jornal entries to reflect which specific bank has been used for customer payments entries, so accounts used would be 572.0.0.00001 and 572.0.0.00002 instead of a generic 572.0.0. (account numbers will differ depending on country)

How that scenario should be configured? Do I need more than one BANK JOURNAL?

By default, all customer payments go to generic 572.0.0 no matter which bank is used for payment.